Move C labels to start-of-line

Also mark the corresponding lint test stable.

Change-Id: Ib7c9ed88c5254bf56e68c01cdbd5ab91cd7bfc2f
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/772
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/cpu/x86/lapic/secondary.S

@@ -47,7 +47,7 @@ _secondary_start:
 1:	hlt
 	jmp	1b
 
-	gdtaddr:
+gdtaddr:
 	.word   gdt_limit	/* the table limit */
 	.long   gdt             /* we know the offset */